IP chain rule syntax Question/Problem

Hi groups.

I have a LAN setup like this.

1.) redhat linux 7.0 server running IP Chains. On this server there are 2
network cards, one connected to the internet with the IP address
217.34.194.x and one on the internal LAN with the IP address 10.11.216.x

I am also running squid for http proxy.

When my windows clients on the 10.11.216.x lan connect to chat.yahoo.co.uk I
get the webpage up and the login goes ok, but as the browser is loading the
chat room I get the error

Unable to connect to server try again in a few minutes.
The browser URL says
http://uk.chat.yahoo.com/?mesg=%3Cli%3EAn+error+occurred+when+the+app...
+communicating+with+the+chat+server.+Please+try+again+sometime+later.+%28con
nect%29

My IP Chains rules look like this

-A forward -s 10.11.216.0/24 -j MASQ
-A input -s 62.30.91.102/24 -d 0/0 -p tcp -y -j ACCEPT
-A input -s 0/0 -d 62.30.91.102/24 -p tcp -y -j ACCEPT

What rule do I have to add to allow my 10.11.216.x clients to connect ???

Thanks,

Matt.

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